Affiliation: | 1. Department of Cardiology, National Hospital Organization, Kanmon Medical Center, 1-1 Chofusotoura-cho, Shimonoseki, Yamaguchi 752-8510, Japan;2. Department of Medicine and Clinical Science, Division of Cardiology, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-kogushi, Ube 755-8505, Japan |